<template>
  <div class="dropdown" ref="dropdownRef">
    <a
      href="#"
      class="btn btn-outline-light my-2 dropdown-toggle"
      @click.prevent="toggleOpen"
      >{{ title }}</a
    >
    <ul class="dropdown-menu" :style="{ display: 'block' }" v-if="isOpen">
      <!-- <li class="dropdown-item"><a href="#">新建文章</a></li>
            <li class="dropdown-item"><a href="#">编辑资料</a></li> -->
      <slot></slot>
    </ul>
  </div>
</template>

<script lang="ts">
import { defineComponent, ref, watch } from 'vue'
import useClickOutside from '../hooks/useClickOutside'

export default defineComponent({
  props: {
    title: {
      type: String,
      required: true
    }
  },
  setup () {
    const isOpen = ref(false)
    const dropdownRef = ref<null | HTMLElement>(null)
    // 控制下拉列表的显示和隐藏
    const toggleOpen = () => {
      isOpen.value = !isOpen.value
    }
    // 点击外部区域自动隐藏
    // const handler = (e: MouseEvent) => {
    //     if(dropdownRef.value) {
    //         console.log(dropdownRef.value);
    //         if(!dropdownRef.value.contains(e.target as HTMLElement) && isOpen.value) {
    //             isOpen.value = false
    //         }
    //     }
    // }
    // onMounted(() => {
    //     document.addEventListener('click', handler)
    // })
    // onUnmounted(() => {
    //     document.removeEventListener('click', handler)
    // })
    const isClickOutSide = useClickOutside(dropdownRef)
    watch(isClickOutSide, () => {
      if (isOpen.value && isClickOutSide.value) {
        isOpen.value = false
      }
    })
    return {
      isOpen,
      toggleOpen,
      dropdownRef
    }
  }
})
</script>
